The problem with what you are doing is that you're using sugar to balance your blood sugar, but your body is not able to handle sugar well and as that sugar gets absorbed so quickly and you get a huge insulin response, your blood glucose can suddenly drop again and it's probably the soda causing it. What you need to do instead, is stabilize your blood glucose and keep it more even so that your glucose levels aren't surging high and then plummeting low all over the place. You need to get off the sugary soda and start eating small healthy meals every few hours to keep your glucose levels more consistent. Your body does not need sugary soda and until you get off that type of thing you are going to have problems with stabilizing it.